Getting off the bus say -- Roberts elementary school were greeted by police officers this morning the change in routine comes after an apparent hit linked. Was found at the school. First thought maybe it's a Valentine let's be honest with you -- it's just some mistake -- -- Barbara. Unfortunate. The note was down by -- substitute teacher school officials have identified the person responsible for making the list -- fourth grade boy it is a very disturbing situation the list included the names of several of his young classmate still it. -- kids on the list. Three -- -- -- for and and the child does have some behavioral difficulties parents dropping off their kids say they are angry that the pool didn't tell them what was going on. We get calls for. For -- days and things like that and cannot even get a note home more a call Scott upsetting. The superintendent -- student safety is top priority the threat is also being investigated by the Attleboro police. It's it's good sadly you know how concerned -- -- nowadays forget it was totally -- parenthood drill now so. You know kind of probably -- something that's -- a small out of proportion. The boy will not be allowed to return to school until the investigation is complete at this time it is unclear whether he is facing any disciplinary actions. In -- borrow Melissa Randall ABC six news.

This transcript has been automatically generated and may not be 100% accurate.

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